FAVOURITES: Scarlet Monastery, easy to find a group, and lots of sellables and good green/blue drops. Also it's got lots of places to explore. I also liked Maraudon, because it's just uber fun - but a friend boosted me through and it took ages... I can't imagine doing it in a normal 5-man. Still, it's nice to have that epic "end-game" feel in a lv45 instance. The last boss of Ramparts is good too, and as a Moonkin I liked Zul'Furrak being outside. Sunken Temple is also super fun, and has that puzzle feel that NO other instance has! SM, ST and Mara are the best, IMO.
LEAST FAVOURITES: Stockades, it's tedious and too short, as well as having next to no good drops. I soloed it three times and found four greens and no blues... What a rip-off! In a 5-man, you'd be lucky to get one green every six runs or something! SM is much better for that level. Also, Ragefire Chasm. It's just so boring and the drops get outdated so quickly because it's lv9. You can't even sell them as twink items because lv12 greens are better than the blues. In my opinion, just spend the time you would in the instance getting to lv16 and go to Wailing Caverns!
LEAST FAVOURITES: Stockades, it's tedious and too short, as well as having next to no good drops. I soloed it three times and found four greens and no blues... What a rip-off! In a 5-man, you'd be lucky to get one green every six runs or something! SM is much better for that level. Also, Ragefire Chasm. It's just so boring and the drops get outdated so quickly because it's lv9. You can't even sell them as twink items because lv12 greens are better than the blues. In my opinion, just spend the time you would in the instance getting to lv16 and go to Wailing Caverns!